The spacing from the m3 diff to the center bearing frame mounting holes is correct for the appropriate m3 shaft. The spacing from trans to center bearing is correct for the 335 shaft. You could do it either way, put the m3 diff end on the 335 shaft or put the 335 trans end on the m3 shaft. Either way it needs to be shorter. For the M3 dct shaft its about 2 cm shorter. Once you see the 2 shafts side by side you'll probably choose to use the beefier m3 shaft.